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F5 F5CAB3 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Apply procedural concepts required to modify and manage virtual servers: This domain covers managing virtual servers including applying persistence, encryption, and protocol profiles, identifying iApp objects, reporting iRules, and showing pool configurations.
Topic 2
  • Apply procedural concepts required to modify and manage pools: This domain addresses managing server pools including health monitors, load balancing methods, priority groups, and service port configurations.

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F5 BIG-IP Administration Data Plane Configuration Sample Questions (Q15-Q20):

NEW QUESTION # 15
In a pool there are 2 pool members out of the 5 members that are older servers. The number of connections these can handle is less than the other 3 pool members. Which load balancing method would allow more traffic to be directed to the newer servers?

Answer: B

Explanation:
When dealing with heterogeneous server hardware where some servers are more powerful than others, a dynamic load balancing method that accounts for both current load and server capacity is required. The Weighted Least Connections (member) method is the most appropriate choice. This method works by tracking the number of active connections to each pool member and then "weighting" that number based on a user-defined Ratio value assigned to the member. For example, the administrator can assign a higher Ratio to the three newer, more powerful servers and a lower Ratio to the two older servers. The BIG-IP then uses a formula to calculate which server should receive the next connection, ensuring that the newer servers handle a proportionately larger share of the total concurrent connections.
Standard Round Robin (Option C) would be ineffective because it distributes connections strictly sequentially (1, 2, 3, 4, 5) without regard for the servers' capacity or current load, which would eventually overwhelm the older servers. Least Connections (member) (Option D) is better than Round Robin because it picks the server with the fewest active connections, but it still assumes all servers are equal; it would try to keep the connection counts identical across all 5 servers, which would still stress the older hardware more than the new. Global Availability (Option B) is a GSLB (DNS-based) method used for multi-site redundancy, not for local pool member load balancing. By using Weighted Least Connections, the administrator achieves a balance where the more capable servers take the brunt of the work while the older servers are utilized only to their specific safe capacity.


NEW QUESTION # 16
Which type of Virtual Server requires the use of a FastL4 profile?

Answer: C

Explanation:
Performance (Layer 4) virtual servers rely on FastL4 profiles to provide high-speed L4 processing without full proxy overhead.
Below is BATCH 2 (next 10 questions) extracted only from your uploaded document that are clearly related to BIG-IP Administration: Data Plane Configuration topics.
โ—As requested, I have strictly excluded questions related to:
Licensing
HA / Device Trust / Sync-only
Logging destinations
User roles
Hardware, EUD, support processes
System-only administration
Source: Your uploaded TMOS Administration v2.0 document


NEW QUESTION # 17
To increase available bandwidth of an existing Trunk, the BIG-IP Administrator is adding additional interfaces. Which command should the BIG-IP Administrator run from within the bash shell?

Answer: D

Explanation:
This question tests precise knowledge of both TMSH command syntax and BIG-IP object namespace hierarchy . Two critical distinctions must be correctly identified:
1. create vs. modify: Since the Trunk already exists and the administrator is adding interfaces to it, the correct verb is modify - not create . Using create on an existing object would either throw an error or attempt to overwrite the object entirely, neither of which is the desired outcome.
2. /sys vs. /net namespace: Trunk objects in BIG-IP reside within the /net namespace, which encompasses network-layer constructs including Trunks, VLANs, Self IPs, and Routes. The /sys namespace is reserved for system-level objects such as management settings, software, and licensing - it does not contain Trunk objects.
Therefore, the only syntactically and functionally correct command is:
tmsh modify /net trunk trunk_A interfaces add {1.3 1.4}
This command appends interfaces 1.3 and 1.4 to the existing trunk_A object without disrupting currently assigned interfaces, increasing aggregated bandwidth accordingly.
Options A and C use the incorrect /sys namespace, and options A and B incorrectly use the create verb for an existing object.
Reference: BIG-IP Administration - Data Plane Configuration, Module: TMSH Command Syntax - Network Object Management.


NEW QUESTION # 18
The BIG-IP Administrator has to provide encrypted communication between users and the virtual server they access. Multiple hostnames are configured in DNS with the same IP address.
Which profile type and setting in the profile should be used? (Choose one answer)

Answer: C

Explanation:
When multiple hostnames resolve to the same IP address and encrypted communication is required, the BIG- IP must be able to present the correct SSL certificate based on the hostname requested by the client. This is accomplished using Server Name Indication (SNI).
According to BIG-IP Administration: Data Plane Configuration documentation:
* SNI is a client-side TLS extension, where the client includes the requested hostname during the SSL handshake.
* BIG-IP evaluates this hostname using the Client SSL profile, not the Server SSL profile.
* The "Server Name" setting in the Client SSL profile enables BIG-IP to select the appropriate SSL certificate for the requested hostname.
Why option C is correct:
* Client SSL profile handles inbound (client-side) encryption.
* Server Name enables SNI-based certificate selection when multiple DNS names share the same virtual server IP.
Why the other options are incorrect:
* A. Client SSL, Client NameThere is no Client SSL setting called Client Name for SNI certificate selection.
* B. Server SSL, Server NameServer SSL is used for encryption between BIG-IP and backend servers, not for client-side hostname identification.
* D. Server SSL, Client NameServer SSL does not process client-requested hostnames during TLS negotiation.
Correct Resolution:
Configure a Client SSL profile and enable the Server Name (SNI) setting to support multiple encrypted hostnames on the same virtual server IP.


NEW QUESTION # 19
Which two load balancing methods consider all the connections the BIG-IP has between it and each backend application server (Pool Member) when making a load balancing decision for a new connection?

Answer: C,D

Explanation:
The two load balancing methods that consider all connections between the BIG-IP and each backend node
- not just connections to a specific pool member - are Least Connections (node) and Weighted Least Connections (node) .
The critical distinction here lies in the node-level scope of evaluation. A node represents the backend server ' s IP address, regardless of how many services or ports it may be serving. Therefore:
* Least Connections (node) directs new connections to the node with the fewest total active connections across all services on that server, providing a holistic connection-count perspective.
* Weighted Least Connections (node) operates identically but factors in an administrator-defined ratio weight, allowing servers with greater capacity to proportionally absorb more connections while still evaluating total node-level connection counts.
By contrast:
* Ratio (member) distributes traffic based on a static weight ratio and does not dynamically evaluate current connection counts.
* Round Robin distributes traffic sequentially in rotation, completely ignoring current connection states on any node or member.
The node-based methods are particularly valuable in environments where a single backend server hosts multiple pool members across different ports, ensuring the server ' s overall load - not just per-service load
- governs balancing decisions.
Reference: BIG-IP Administration - Data Plane Configuration, Module: Load Balancing Methods - Member vs. Node Scope.


NEW QUESTION # 20
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